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Mechanical Engineering :: Thermodynamics

  1. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant

  2. A.

     Pressure

    B.

     Temperature

    C.

     Volume

    D.

     Internal energy

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  3. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant

  4. A.

     Pressure

    B.

     Temperature

    C.

     Volume

    D.

     Internal energy

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  5. A definite area or a space where some thermodynamic process takes place is known as

  6. A.

     Thermodynamic system

    B.

     Thermodynamic cycle

    C.

     Thermodynamic process

    D.

     Thermodynamic law

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  7. The work ratio of a gas turbine plant is given by

  8. A.

     (Net work output)/(Work-done by the turbine)

    B.

     (Net work output)/(Heat supplied)

    C.

     (Actual temperature drop)/(Isentropic temperature drop)

    D.

     (Isentropic increase in temperature)/(Actual increase in temperature)

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  9. The mass of excess air supplied is equal to

  10. A.

     (23/100) × Mass of excess carbon

    B.

     (23/100) × Mass of excess oxygen

    C.

     (100/23) × Mass of excess carbon

    D.

     (100/23) × Mass of excess oxygen

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  11. An ideal gas as compared to a real gas at very high pressure occupies

  12. A.

     More volume

    B.

     Less volume

    C.

     Same volume

    D.

     Unpredictable behavior

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  13. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

  14. A.

     Cracking

    B.

     Fractional distillation

    C.

     Full distillation

    D.

     Carbonisation

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  15. If the value of n = 0 in the equation pvn = C, then the process is called

  16. A.

     Constant volume process

    B.

     Adiabatic process

    C.

     Constant pressure process

    D.

     Isothermal process

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  17. If in the equation pvn = C, the value of n = ∝, then the process is called

  18. A.

     Constant volume process

    B.

     Adiabatic process

    C.

     Constant pressure process

    D.

     Isothermal process

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  19. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called

  20. A.

     Free expansion

    B.

     Hyperbolic expansion

    C.

     Adiabatic expansion

    D.

     Parabolic expansion

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